In a mixing bowl, combine contents of cake mix and baking soda. Add eggs, buttermilk, food coloring and vanilla; blend on low until moistened. Beat on high for 2 minutes. Pour into two Pam sprayed 9 inch round cake pans. Bake at 350 degrees for 30-35 minutes or until a toothpick inserted near center comes out clean. Cool for 10 minutes; remove from pan, cool and frost with cream cheese frosting.
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